Generally If you have a harness problem the control either works or doesn't. Check the continuity of each injector wire, if they all check out close try one of the following.
Complicated:
For about 70 bucks you can get multimeter at Radio shack that will allow you to read pulse width. Youget software with it that will allow you to data log. You could wire this up to read various injectors at specific rpm & compare.
Easy:
Simply borrow an injector harness fro a car that works.
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